Automobile-muffler.



B. L. DEWEY;

AUTOMOBILE MUFFLER.

APPLICATION FILED MABJO, 191s.

Patented Nov. 4, 1913.

2 SHEETS-SHEET 1.

' 1770672755 .fJWar-r/ LH/DQMQ/ E. L. DEWEY.

AUTOMOBILE MUFFLER. I APPLICATION FILED MAR. 10, 1913.

1,077,905. Patented Nov. 4, 1913.

2 SHEETS-SHEET 2.

EDWARD L. DEWEY, OF WHITING, INDIANA.

AUTOMOBILE-MUFFLER.

\ Specification of Letters Patent.

, Application filed March. 10, 1913.

Patented Nov. 4, 1913.

Serial No. 753,326.

To all-whom it may concern:

Be it known that I, EDWARD L. DEWEY, citizen of the United States, residing at Whiting, in the county of Lake and State of Indiana, have invented certain new and useful Improvements in Automobile-Mufflers; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to mufflers or silencers for the exhaust pipes of internal combustion engines, being particularly adapted for use in connection with gasolene engines as used on automobiles.

The prime object of my invention is to provide a silencer adapted to be inserted in the exhaust pipe of the engine, which silencer will simultaneously rov'ide for the soundmuffling expansion oi the exhaust gases and for utilizing the heat of the exhaust gases for warming the air-supply of the engine.

Another object is to provide a silencer of simple construction and one which may easily be detached for cleaning the flues thereof.

Still another object is to provide means for causing the air drawn into the engine to impinge upon a large surface of passages heated by the exhaust of the engine.

Other objects will appear from the accompanying drawings, in whichi Figure -1 is a view of a silencer and air-heater embodying my invention. Fig. 2- is a longitudinal section of the same. Figs. -3- and -4.- are transverse sections through Fig.'-2- along the lines 3-3 and 44 respectively. Figs. 5- and are elevations of two of the air-deflecting partitions used in the embodiments of Figs. 1- and 2. Fig. 7- is an alternative embodiment of my invention.

In the embodiment shown in Figs. -1- to 6 inclusive, the appliance of my invention consists of a flange 1 screwed to the exhaust passage 2 of-the engine. Fastened to this flange are the smaller ends of a pair of concentric funnels -3 and '4.- the larger ends of which funnels are secured by bolts 5 to the enlarged head 6 of a cylindrical casing 7. The other end. of the casing 7 likewise has a head 8, the rim portion of which is connected by a tapering or funnel-shaped shell 9 to the exhaust pipe 10. Within the casing 7 and mounted in corresponding perforations in the heads -6 and 8-, are tubes 11 and 12,

through which the exhaust gases may pass from the interior 13 of the inner funnel 3-, to the tapering chamber l t at the other end of the cylindrical casing and thence to the exhaust pipe 10-.

Connecting the radially projecting portion 15 of the head -6- with theadjacent end of the casing 7 is an annular flange -16, which coacts with the head portion 15 and the adjoining end portion of the casing 7 to form an annular chamber 17-. Openings -18 in the casing and perforations --19 in the rim -15 of the head connect the chamber 17- with the interior of the casing and the space 20 between the two funnels 3- and -4- respectively. Near the other end of the casing 7-, the latter has a number of openings 21 for admitting air from outside the casing to the interior of the same, while a pipe -22- screwed to the outer funnel 4 connects the chamber 20 with the air-intake passage of the engine.

When the engine in connection with which the muffler of my invention is used is in operation, the exhaust gases from the engine will pass from the pipe 2- into the cham- Joer 13, in which these gases may expand rapidly and from which they may pass through the tubes --11- and '12- to the outward chamber 14-- and thence through the pipe 10- to the outer air. 7

By making the total cross-sectional area of the tubes .11 and 1.3 considerably larger than that of the exhaust pipe 2 of the engine, the exhaust gases will be permitted to expand rapidly to many times their former volume while passing through the chamber 13- andthe tubes -11- and 12. Consequently, the usual noise of the exhaust will be effectively muflied. At the same time, the heat of the exhaust gases will warm the tubes -11- and -12 and the air surrounding the latter within the casing. Hence the air for the operation of the engine will be warmed while being drawn through the openings -21 into the casing, and through'the chambers 17- and 20 to the intake pipe -2% of the engine. To prevent the air from passing from the inlet openings -21 to the outlet preferably provide transverse partitions 23 and 24 within the casing which partitions leave annular openings alternately close to the central pipe 11-- and the casing 7. When the casing of my mufller is thus equipped with transverse air-directing partitions, the intake air for the engine will be obliged to follow a sinuous path within the casing, somewhat as shown by the arrows in Fig. -2. Consequently,

the air will contact with practically the entire outer surface of the muffler pipes While passing through the casin and will be effectively heated by the ex aust gases passing through the said pipes. Likewise, the air while passing through the chamber 20 will be additionally warmed by the heat of the gases within the expansion chamber l3.

While 1 preferably provide a series of transverse partitions for redirecting the aircurrents within the casing and causing them to impinge repeatedly on the tubes within the casing, I do not wish to be limited to this construction, nor to other modifications which might be made in my device without departing from the spirit of my invention. For example, bot-h the transverse air-deflecting partitions and the projecting rims of the heads of the muffler casing might be omitted, as in Fig. 7, While still providing an effective noise-muffling expansion chamber and likewise providing for the warming of the intake air while passing through the casing. In either case, by removing the bolts.5 or 25, the tapering ends of the muffler may readily be detached from the cylindrical portion thereof, thereby affording access to the interior of the tubes -11- and 12 for removing soot or other deposit. The inlet openings 21 of the casing are preferably placed radially out of line with the outer tubes l2 and preferably elongated longitudinally of the casing, but their shape, location and number may be varied as desired.

By providing an expansion chamber in which the exhaust gases may rapidly expand and by passing the air-supply for the carbureter of the engine through a chamber housing the said expansion chamber (whereby the exhaust gases may impart a portion of their heat to the intake air for the engine), and by likewise providing a large flue surface exposed on its opposite sides to the exhaust gases and the intake air respectively, I am able to effect a rapid expanding and cooling of the exhaust gases. Consequently, the muflier of my invention will effectively reduce the back pressure to an extent which has not been possible with the mufflers heretofore in use.

I claim as my invention:

1. A muffler for internal combustion engines, comprising a plurality of substanf tially parallel tubes through which the exhaust of the engine is adapted to pass, the total crosssectional area of the said tubes greater than the area of the exhaust pipe of the engine, and a casing housing the said plurality of tubes, there being openings leading from the interior of said casing to the outer air and to the air intake passage of the engine respectively.

2. A muffler for internal combustion engines, comprising a plurality of tubes through which the exhaust of the engine is adapted to pass, the total cross-sectional area of the said tubes greater than the area of the exhaust pipe of the engine, and a casing housing the said tubes, there being openings leading from the interior of said casing to the outer-air and to the air intake passage of the engine respectively; and an air-deflecting partition Within said casing transverse to said tubes.

3. A mutller for internal combustion engines, comprising a plurality of tubes through which the exhaust of the engine is adapted to pass, the'total cross-sectional area of the said tubes greater than the area of the exhaust pipe of the engine, and a casing housing the said tubes, there being openings leading from the interior of said casing to the outer air and to the air intake passage of the engine respectively; and a plurality of air-deflecting partitions within said casing transverse to the said tubes.

4:. A muffler for internal combustion engines, comprising a substantially cylindrical enlargement of the exhaust passage of the engine; perforated heads positioned at each end of the said enlargement; tubes mounted at their opposite ends in the perforations of the said heads, the total cross-sectional area of saidtubes greater than that of the said exhaust passage; and a passage leading from one end of the cylindrical enlargement to the air-intake of the engine; there being an opening in the said substantially cylindrical enlargement in proximity to its other end.

5. A muffler for internal combustion engines, comprising a substantially cylindrical enlargement of the exhaust passage of the engine; perforated heads positioned at each end of the said enlargement; tubes mounted at their opposite ends in the perforations of the said heads, the total cross-sectional area of said tubes greater than that of the said exhaust passage; and a passage leading from one end of the cylindrical enlargement to the air-intake of the engine; there being a plurality of openings in the said substantially cylindrical enlargement in proximity to its other end.

6. A muffler for internal combustion engines, comprising a substantially cylindrical enlargement of the exhaust passage of the engine; perforated heads positioned at each end of the said enlargement; tubes mounted at their opposite ends in the perforations of the said heads, the total cross-sectional area of said tubes greater than that of the said exhaust passage; and a passage leading from one end of the cylindrical enlargement to the air-intake of the engine; there being an opening in the said substantially cylindrical enlargement in proximity to its other end; and an air-deflecting partition transverse of the said cylindrical enlargement and positioned therein between the said passage and the said opening.

7. A muflier for internal combustion engines, comprising a substantially cylindrical enlargement of the exhaust passage of the engine; perforated heads positioned at each end of the said enlargement; tubes mounted at their opposite ends, in the perforations of the said heads, the total cross-sectional area of said tubes greater than that of the said exhaust passage; and a passage leading from one end of the cylindrical enlargement to the air-intake of the engine; there being a plurality of openings in the said substantially cylindrical enlargement in proximity to its other end; and an air-deflecting partition transverse of the said cylindrical enlargement and positioned therein between the said passage and the said opening.

8. A mufller for internal combustion engines, comprising a substantially cylindrical enlargement of the exhaust passage of the engine; perforated heads positioned at .each end of the said enlargement; tubes mounted at their opposite ends in the perforations of the said heads, the total cross-sectional area of said tubes greater than that of the said exhaust passage, and a passage leading from one end of the cylindrical enlargement to the air-intake of the engine; .there being a plurality of openings in the said substantially cylindrical enlargement in proximity to its other end; and a'plurality of air-defleeting partitions transverse of the said enlargement and positioned therein between the said opening and the juncture of the enlargement with the said passage.

9. A muffler for an engine having an exhaust passage and an air-intake passage, comprising an expansion chamber connected to the said exhaust passage; a plurality of tubes leading from the said expansion chamber to an exhaust pipe opening into the outer air; and a casing housing the said tubes, the interior of said casing connected in proximity to the opposite ends of the said tubes with the outer air and with the said intake passage of the engine respectively.

10. A mufller for an engine having an exhaust passage and an air-intake passage, comprising an expansion chamber connected to the said exhaust passage; a plurality of tubes leading from the said expansion chamber to an exhaust pipe opening into the outer air; and a casing housing the said tubes and expansion chamber, the interior of said casing connected in proximity to the opposite ends of the said tubes with the outer air and with the said intake passage of the engine respectively.v

11. A mufiier for an engine having an exhaust passage and an air-intake passage, comprising an expansion chamber connected to the said exhaust passage; a plurality of tubes leading from the said expansion chamber to an exhaust pipe opening into the outer air; and a casing housing the said tubes, the interior of said casing connected in proximity to the opposite ends of the said tubes with the outer air and with the said intake passage of the engine respectively; and air-deflecting partitions transversely mounted within the said casing.

In testimony whereof I have signed my name in presence of two subscribing witnesses.

- EDWARD L. DEWEY. Witnesses:

ALBERT SGHEIBLE,

M. M. BOYLE. 

